Overview
- A 15.2 cm (6 inches) hailstone measured in Kankakee on March 10 remains unofficial as NWS and NCEI complete verification.
- If confirmed, the Kankakee measurement would surpass Illinois’ current official record of 12.1 cm (4.75 inches) from Minooka in 2015.
- NWS reporting logged multiple additional giant-hail occurrences, including 14 cm near Campus, 13.2 cm southwest of Kankakee, and 12.7 cm near Buckingham.
- A separate supercell in the Chicago southwest suburbs produced 12.2 cm hail in Darien during the same severe-weather episode.
- Tornadoes were confirmed, and the Kankakee-area supercell tracked into northwestern Indiana with reports of significant hail and tornadic damage, alongside preliminary damage in Illinois including broken windows, roof and vehicle damage, and downed power lines.